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I didn't change anything. Including the initial activity and visibility. To be more precise, I changed the first ("0") task. There was 'true' in 'Instant Victory'. I thought that was the reason.
It seems that was the case - because you set the "possible" (instead of "false") icon for "Instant Victory" for this task.
Added 1 minute ago
There are primary and secondary tasks. Use only secondary tasks. Primary tasks may contain both additional parameters and conditions.
The division into primary and secondary also makes sense - so you don't have to worry about manually setting the condition for "Instant Victory" or "Defeat" (in case the task fails).